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Accession Number : ADA213328

Title : The Mechanical Response of M30, JA2 and XM39 Gun Propellants to High-Rate Deformation

Abstract : The mechanical response of gun propellant to high rate deformation plays a critical role in the performance of guns and in the violence of the response of the propellant to vulnerability threats. However, unlike engineering materials, which have most of their critical characterizations performed within a range of state from stress-free up to conditions of failure, propellant performance is most affected by mechanical response only after failure has occurred. The high rate mechanical properties measurements of M30, JA2 and XM39 gun propellants that have been gathered over the past several years, and the procedure by which these data were gathered and analyzed are documented in this report. The conditions under which the tests have been performed encompass the temperature range of ballistic interest, include strain rates from static to 10, 000/s, and cover regions of pressure from atmospheric to 400 MPa. These results are presented and analyzed to show the nature of the mechanical response changes. Constitutive relationships were extracted from these results and are presented. These equations that may be used as an initial attempt to predict the interior ballistic mechanical response under operational conditions. Appendices contain the data acquisition and reduction program, the uniaxial compressive gun propellant test procedure, and an illustration explaining the measured parameters. Keywords: Fracture(Mechanics); Damage.